text: // Copyright 2014 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  /*
   * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
   * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
   *     (http://www.torchmobile.com/)
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1.  Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer.
   * 2.  Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution.
   * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
   *     its contributors may be used to endorse or promote products derived
   *     from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef CONTENT_RENDERER_HISTORY_ENTRY_H_
  #define CONTENT_RENDERER_HISTORY_ENTRY_H_
  
  #include <memory>
  #include <vector>
  
  #include "base/containers/hash_tables.h"
  #include "base/macros.h"
  #include "base/memory/weak_ptr.h"
  #include "content/common/content_export.h"
  #include "third_party/blink/public/platform/web_url_request.h"
  #include "third_party/blink/public/web/web_history_item.h"
  
  namespace content {
  
  class CONTENT_EXPORT HistoryEntry {
   public:
    class CONTENT_EXPORT HistoryNode {
     public:
      HistoryNode(const base::WeakPtr<HistoryEntry>& entry,
                  const blink::WebHistoryItem& item);
      ~HistoryNode();
  
      HistoryNode* AddChild(const blink::WebHistoryItem& item);
      HistoryNode* AddChild();
      blink::WebHistoryItem& item() { return item_; }
      void set_item(const blink::WebHistoryItem& item);
      std::vector<HistoryNode*> children() const;
      void RemoveChildren();
  
     private:
      // When a HistoryEntry is destroyed, it takes all its HistoryNodes with it.
      // Use a WeakPtr to ensure that HistoryNodes don't try to illegally access
      // a dying HistoryEntry, or do unnecessary work when the whole entry is
      // being destroyed.
      base::WeakPtr<HistoryEntry> entry_;
      std::vector<std::unique_ptr<HistoryNode>> children_;
      blink::WebHistoryItem item_;
  
      DISALLOW_COPY_AND_ASSIGN(HistoryNode);
    };
  
    HistoryEntry(const blink::WebHistoryItem& root);
    HistoryEntry();
    ~HistoryEntry();
  
    const blink::WebHistoryItem& root() const { return root_->item(); }
    HistoryNode* root_history_node() const { return root_.get(); }
  
   private:
    std::unique_ptr<HistoryNode> root_;
  
    base::WeakPtrFactory<HistoryEntry> weak_ptr_factory_;
  
    DISALLOW_COPY_AND_ASSIGN(HistoryEntry);
  };
  
  }  // namespace content
  
  #endif  // CONTENT_RENDERER_HISTORY_ENTRY_H_
  